Journal: bioRxiv
Article Title: Mature tuft cell phenotypes are sequentially expressed along the intestinal crypt-villus axis following cytokine-induced tuft cell hyperplasia
doi: 10.1101/2024.11.28.625899
Figure Lengend Snippet: (a) Culture setup to test tuft cell differentiation. Tuft-type reporter organoids were pretreated with IL-4 and IL13 on the 3 rd day after seeding in ENR (EGF, R-spondin and Noggin) medium. On the 4 th day, various factors were added to, or depleted from the medium. Frequency of tuft-type induction was tested at day 7 with flow cytometry. (b) Left, percentage of ChAT-eGFP + cells in organoids treated with IL-4 and IL-13 in presence or absence of crypt or villus/autocrine-inspired signaling factors. Right, fold change induction of ChAT-eGFP + cells after addition of single villus/autocrine-inspired factors to cytokine-pretreated organoids without ENR. Data are represented as mean ± SD (ANOVA p < 0.0001, *** adjusted p-value < 0.001, **** adjusted p-value < 0.0001, Tukey HSD test). (c) Representative flow cytometry analysis of fluorescent population frequencies in indicated tuft-type reporter organoids treated with ENR and cytokines (crypt+IL4+IL13) or villus-inspired medium (no ENR; with IL-25, WNT5a, NRG1, BMP2, BMP4 and acetylcholine chloride) after IL-4 and IL-13 pretreatment. (d) Microscopic stills from live imaging experiments of organoids in villus-inspired medium (no ENR; with IL-25, WNT5a, NRG1, BMP2, BMP4 and acetylcholine chloride) after IL-4 and IL-13 pretreatment. Left: confocal brightfield image of ChAT BAC -eGFP; Nrep P2A-mScarlet-I organoid at the start of imaging. Right: stills of fluorescence channels (mSarlet-I: red, eGFP: green) from timepoints preceding and following co-expression of fluorescent markers. Cell that shows co-expression is indicated with a white arrowhead throughout imaging timepoints. (e) Average mScarlet-I signal over time in Nrep P2A-mScarlet-I organoids in medium with ENR and cytokines (top; crypt) or villus-inspired medium (no ENR; with IL-25, WNT5a, NRG1, BMP2, BMP4 and acetylcholine chloride) after IL-4 and IL-13 pretreatment (bottom; villus). Shading in plot represents SEM. Number of cells comprising each graph are indicated. (f) Barplot showing fraction of mScarlet-I + cells in Nrep P2A-mScarlet-I organoids with stable/rising fluorescence signal or declining fluorescence signal in crypt or villus medium with cytokines (IL4+IL13). Related to e. Number of cells comprising each graph are indicated. (g) Transcriptomic analysis of single cells in organoids upon induction with cytokines in ENR or villus-inspired culture conditions. Left, UMAP of organoid cells being enriched for tuft cells by FACS. Cell types are annotated by color. EE: enteroendocrine cells. Right, same UMAP but cells are colored by medium condition. (h) Violin plots depicting distribution of relative levels of tuft signature scores in tuft-1 cells (left) or tuft-2 cells (right) origating from different culture conditions (ns not significant, ** p-value < 0.01, *** p-value < 0.001, Wilcoxon rank sum test). (i) RNA velocity-based trajectory inference superimposed on UMAP of predicts unidirectional differentiation from tuft-1 to tuft-2 transcriptomic states.
Article Snippet: Thereafter, tuft cell maturation was facilitated by removal of EGF, Noggin and R-spondin from the medium and addition of one of the following or a combination thereof on the 4 th day after passaging: recombinant murine IL-25 (20 ng/ml, Immunotools), recombinant human BMP2 (20 ng/ml, Immunotools), recombinant human BMP4 (20 ng/ml, Immunotools), recombinant human NRG1 (20 ng/ml, R&D systems), recombinant murine WNT5a (20 ng/ml, Biotechne) and acetylcholine chloride (100 μM, Sigma Aldrich).
Techniques: Cell Differentiation, Flow Cytometry, Imaging, Fluorescence, Expressing